<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>计算圆面积和周长</title>
</head>
<body>
<h2>请输入圆的半径：</h2>
<form action="CircleAreaServlet" method="post">
    <label for="radius">半径:</label>
    <input type="text" id="radius" name="radius"><br><br>
    <input type="submit" value="计算">
</form>
</body>
</html>